slibc, the Stockholm C Library, is an implementation of a C libray, for POSIX, just for fun. slibc does not aim to support C++, or any other language than C. Furthermore, it does not try to support older versions of C than C99. Macro definitions: _SLIBC_SOURCE -- Enable slibc extensions. _GNU_SOURCE -- Enable glibc extensions (GNU extensions.) _SLIBC_SUPPRESS_WARNINGS -- Suppress all #warning, this is primarily intended to be used when compiling slibc. _PORTABLE_SOURCE -- Unconditionally disable all extensions.